2次元丘を通り過ぎる乱流境界層の数値解析(解析・予測・制御乱流の予測とモデリング(2),一般講演)

概要

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This paper presents evaluations for the prediction accuracy of various SGS models of LES under the simple condition of urban environment, i.e., various thermally-stratified turbulent boundary layers are calculated by evaluated LES models, namely, the Smagorinsky and the Mixed-Time-Scale models, the representative SGS model for the velocity field, and the constant turbulent Prandtl number model for the thermal field. These models are evaluated in comparison with a DNS database, in which the problems of LES in the prediction of various thermally-stratified boundary layers are elucidated. On the other hand, in order to evaluate the prediction accuracy of various models in a complicated turbulent flow field, the LES and the hybrid LES/RANS (HLR) models are examined in a turbulent boundary layer over a 2-dimensional hill. These results are assessed using newly-conducted DNS results of a 2-dimensional hill, and the prediction accuracy of these models is clarified in the calculation of a complicated turbulent flow field.
日本流体力学会の論文
2009-09-02